ASTM B366 buttweld fittings in Inconel, Hastelloy, Monel, and Alloy 825 — for extreme corrosion resistance, high-temperature service, and applications where stainless steel reaches its performance limits.
Broadest-use nickel alloy. 9% Mo + Nb. High strength, corrosion resistance across a wide pH range. Subsea, offshore, marine, aerospace. Filler ERNiCrMo-3.
Al₂O₃ oxide scale — best oxidation resistance of the Inconel family. Industrial furnaces, thermal processing, carbon black, calcination. Filler ERNiCrFe-11.
Widest corrosion resistance of any commercial alloy. 16% Mo + W. Strongest in reducing environments. Wet scrubbers, HCl service, strong acids. Filler ERNiCrMo-4.
Higher Cr (21%) than C-276 (16%) — superior for oxidising + reducing mixed environments. FGD scrubbers, wet chlorine gas, mixed acid. Filler ERNiCrMo-10.
No tungsten — best thermal stability of C-family at 650–1040°C. No μ/P-phase precipitation. High-temp reducing acid service. Filler ERNiCrMo-7.
Only commercial alloy immune to hydrofluoric acid at all concentrations. NiF₂+CuF₂ fluoride film. HF alkylation, UF₆ processing, saltwater piping. Stress-relief 870–900°C mandatory for HF service. Filler ERNiCu-7.
38–46% Ni, 2.5–3.5% Mo, 1.5–3% Cu. NACE MR0175 SCC resistance. Sour gas, H₂SO₄, H₃PO₄. Cu addition for reducing acid resistance. Filler ERNiCrMo-3.
| Alloy | EN No. | Primary Strength | Choose When |
|---|---|---|---|
| Inconel 625 | 2.4856 | Broad corrosion + strength | Subsea, marine, mixed media, high strength |
| Inconel 601 | 2.4851 | Oxidation resistance to 1200°C | Industrial furnaces, thermal processing |
| Hastelloy C-276 | 2.4819 | Broadest corrosion range | Reducing acids, scrubbers, HCl |
| Hastelloy C-22 | 2.4602 | Mixed oxidising + reducing | FGD, chlorinated + oxidising environments |
| Hastelloy C-4 | 2.4610 | Thermal stability at 650–1040°C | High-temp reducing acid, no sigma risk |
| Monel 400 | 2.4360 | HF immunity, all concentrations | HF alkylation, fluorine service, saltwater |
| Alloy 825 | 2.4858 | NACE + reducing acid + sour gas | H₂SO₄, H₃PO₄, sour gas, seawater |
ASTM B366, dimensions to ASME B16.9 (EN 10253 does not cover nickel alloys). EN 10204 3.1. PMI (XRF) on all nickel alloy orders. NACE MR0175. Contact us with UNS or EN number, size schedule, and delivery location.
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